Dental implantation system

ABSTRACT

A damping dental post key configured to implant a dental root post for restoration of a tooth is described. The dental post key includes a body for handling and a post carrier having a key shape with respect to a head portion of the dental root post. During implantation of the dental post, rotation of the body compresses a set of springs in contact with the post carrier reducing a reaction force to a tooth root. In this way a limited force will be applied and a root fracture can be prevented. Further, the dental post key can be configured to have a fixed movement in a counterclockwise direction to remove the dental post and a free quarter-cycle movement with effort in a clockwise direction.

BACKGROUND Field

The present disclosure relates to a damping dental post key forimplanting a dental root post during restoration of a tooth.

SUMMARY

The present disclosure relates to a damping dental post key configuredto implant a dental root post or dental post for restoration of a tooth.The dental post key includes a body for handling and a post carrierhaving a key shape with respect to a head portion of the dental post.During implantation of the dental post, rotation of the body compressesa set of springs in contact with the post carrier reducing a reactionforce. This dynamic force configured to rotate the dental root post intoa prepared root canal of the tooth in a smooth way. In this way alimited force will be applied and a root fracture can be prevented.Further, the dental post key can be configured to have a fixed movementin a counterclockwise direction to remove the dental post and a freequarter-cycle movement with effort in a clockwise direction.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of the invention and many of the attendantadvantages thereof will be readily obtained as the same becomes betterunderstood by reference to the following detailed description whenconsidered in connection with the accompanying drawings, wherein:

FIG. 1A is a perspective view drawing of a dental post that is dividedinto a head portion and a root portion, where the root portion includesan apical section including threads and a cervical section withoutthreads according to an example;

FIG. 1B is a perspective view drawing of the dental post of FIG. 1Aincluding grooves that extend to only the cervical section of the rootportion according to an example;

FIG. 1C is a perspective view drawing of the dental post of FIG. 1Aincluding grooves that extend to the entire root portion according to anexample;

FIG. 2A is a perspective view drawing of a dental post that is dividedinto a head portion and a root portion, where the root portion includesan apical section without threads and a cervical section includingthreads according to an example;

FIG. 2B is a perspective view drawing of the dental post of FIG. 2Aincluding grooves that extend to only the cervical section of the rootportion according to an example;

FIG. 2C is a perspective view drawing of the dental post of FIG. 2Aincluding grooves that extend to the entire root portion according to anexample;

FIG. 3A is a perspective view drawing of a dental post that is dividedinto a head portion and a root portion, where the root portion includesa set of grooves, where each groove has a V-shape according to anexample;

FIG. 3B is a perspective view drawing of a dental post that is dividedinto a head portion and a root portion, where the root portion includesa set of grooves, where each groove has a square-shape according to anexample;

FIGS. 4A-4E are a set of examples of an extrusion profile forming athread in a longitudinal axis;

FIGS. 5A-5I are drawings of a set of examples of a horizontalcross-section shape of a groove;

FIGS. 6A-6F show different perspective views of a head portion having aset of horizontal grooves, a pair of flat surfaces, and a slotconfigured to receive a dental post key according to an example;

FIGS. 7A-7F show different perspective views of the head portion ofFIGS. 6A-6F having tapered shape along longitudinal axis according to anexample;

FIGS. 8A-8D show different side, perspective, and cross-sectional viewsof a head portion having a set of horizontal grooves, a pair of flatsurfaces, and a slot configured to receive a dental post key accordingto an example;

FIGS. 8E-8H show a cross-sectional and perspective view of the headportion shown in FIGS. 8A-8D further including a second set of verticalgrooves along longitudinal axis that intersect the set of horizontalgrooves according to an example;

FIGS. 9A-9D show different side, perspective, and cross-sectional viewsof a head portion having a square shape and a slot configured to receivea dental post key according to an example;

FIGS. 9E-9H show a cross-sectional and perspective view of the headportion shown in FIGS. 9A-9D further including a second slot thatintersects the first slot according to an example;

FIGS. 10A-10K show different side, perspective, and cross-sectionalviews a dental post including the head portion of FIGS. 8A-8D and theroot portion of FIG. 3A according to an example;

FIGS. 11A-11K show different side, perspective, and cross-sectionalviews a dental post including the head portion of FIGS. 8E-8H and theroot portion of FIG. 3B according to an example;

FIGS. 12A-12M show different side, perspective, and cross-sectionalviews a dental post including the head portion of FIGS. 6A-6F and theroot portion of FIG. 2B according to an example;

FIGS. 13A-13N show different side, perspective, and cross-sectionalviews a dental post including the head portion of FIGS. 7A-7F and theroot portion of FIG. 1B according to an example;

FIG. 14A shows a perspective drawing of a dental post key including abody having a cover and a post carrier, protruding the cover, having akey shape configured to turn a respective dental post according to anexample;

FIG. 14B shows a drawing of a dental post key, without the cover,including a set of springs configured to resist a force between the postcarrier and the body according to an example;

FIG. 14C shows a drawing of a dental post key, without the cover,including a set of torsion springs configured to resist a force betweenthe post carrier and the body according to an example;

FIG. 14D shows a drawing of a dental post key, without the cover,including a post carrier having a set of plate spring configured toresist a force between the post carrier and the body according to anexample;

FIG. 14E shows a perspective drawing of expanded parts of the dentalpost key of FIG. 14B with cover according to an example;

FIG. 14F shows a perspective drawing of expanded parts of the dentalpost key of FIG. 14C with cover according to an example;

FIGS. 15A-15F show a series of perspective views of the post carrier ofFIG. 14B according to an example;

FIGS. 16A-16G are a series of perspective views of the post carrier ofFIG. 14C according to an example;

FIGS. 17A-17F are a series of perspective views of examples of the keyshape of a post carrier configured to match a respective dental post;

FIG. 18 shows an example of a dental post key and a dental post of FIG.1A that will implant into a prepared root canal of a tooth model in aclockwise direction according to an example;

FIG. 19A shows a cross-section view of an example of a tooth modelhaving a root surrounded by periodontal ligament and bone, and restoredwith the dental post of FIG. 13B, core and crown according to anexample;

FIG. 19B shows a cross-section view of a tooth model of FIG. 19Arestored with the dental post of FIG. 12B, core and crown according toan example; and

FIG. 19C shows a cross-section view of a tooth model of FIG. 19Arestored with the dental post of FIG. 10D, core and crown according toan example.

DETAILED DESCRIPTION

The present disclosure relates to a dental root post for restoration ofa tooth, and a damping dental post key for implanting a threaded dentalpost into a prepared root canal. The dental post is configured to giveenhanced retention to a tooth core as well as for final restorationmaterials and end caps. The dental post can be divided into a headportion and a root portion, each having different features depending ona depth required for the restoration. The root portion is configured tohave two conical level sections; a cervical flared shape section andapical conical section to obtain more adaptation to the root canal. Thehead portion can be configured to serve for reconstruction a core with acomposite material or an amalgam or any permanent dental fillingmaterial. The dental post is preferably made from a metal such asstainless steel and titanium or an alloy such as Ni—Cr alloy, but can beany other suitable material. A root channel can be initially prepared byuse of suitable instruments having a same shape and wider size (0.2 mm)of the root post. The dental root post can subsequently be implanted andsecured to the tooth with dental cement.

Referring now to the drawings, wherein like reference numerals designateidentical or corresponding parts throughout the several views.

Dental Post Model 1

In a first embodiment, a dental post 100 a-c can be divided into a headportion 110 a-c and a root portion 120 a-c. The root portion 120 a-cincludes a cervical section 122 a-c having a flared shape and an apicalsection 124 a-c having threads (See FIGS. 1A, 1B, 1C). The flared shapehas a thickness such that mastication stress will be configured toconcentrate on an upper or coronal part of the cervical section 122 a-c.The apical section 124 a-c is configured to give stabilization and allowconservation of a root tissue. The cervical section 122 a-c isconfigured to give maximum support to a final restoration bytransferring stress to the coronal part of the root tissue and toprovide more protection from harmful stress on the apical root tissue.

The cervical section 122 a-c is non-active (i.e. non-threaded) and flareshaped radially-decreasing conical axial profile along longitudinal axisbetween for example 6-18 degrees. The apical section 124 a-c is active(i.e. threaded) tapered radially-decreasing conical axial profile alonglongitudinal axis between for example 1-5 degrees.

The dental post 100 a-c is preferably used for roots having short-lengthand can have no grooves or 1 to 2 grooves. The grooves allow excessivecement to flow outside a tooth root canal and prevent from hydraulicpressure between the dental root post and the tooth's canal wall. Thegrooves can have different shapes as shown in FIGS. 5A-5I. The threadsof the apical section 124 a-c can be configured to serve as an anchorand can have different shapes with for example 0.1 mm height and forexample 0.25 to 0.5 mm width, as shown in FIGS. 4A-4E.

FIG. 1A shows an example of a dental post 100 a without groves. FIG. 1Bshows an example of a dental post 100 b including grooves 132 thatextend to only the cervical section 122 b of the root portion 120 b. Thegrooves can extend to the entire root portion or only to the cervicalsection depending on the post sizes (i.e. length and diameter). In anexample, the grooves can extend 0.5 to 1 mm diameter on cervical level.In an example, the grooves can extend 0.2 to 0.5 mm on the apex level.FIG. 1C shows an example of a dental post 100 c including grooves 134that extend to the entire root portion 120 c.

Dental Post Model 2

In a second embodiment, a dental post 200 a-c can be divided into a headportion 210 a-c and a root portion 220 a-c that includes a cervicalsection 222 a-c having a flared shape and threads, and an apical section224 a-c (See FIGS. 2A, 2B, 2C).

The cervical section 222 a-c is active (i.e. threaded) and flare-shapedradially-decreasing conical axial profile along longitudinal axisbetween for example 6-18 degrees. The apical section 224 a-c isnon-active (i.e. non-threaded) tapered radially-decreasing conical axialprofile along longitudinal axis between for example 1-5 degrees.

The dental post 200 a-c can have no grooves or 1 to 4 grooves. Thegrooves can extend to the entire root portion or only to the cervicalsection, with 0.5 to 1 mm diameter on cervical level and 0.2 to 0.5 mmon the apex level, depending on the post sizes (i.e. length anddiameter). The grooves allow excessive cement to flow outside the toothroot canal and prevent from hydraulic pressure. The grooves can havedifferent shapes as shown in FIGS. 5A-5I. The threads of the cervicalsection 222 a-c can be configured to serve as an anchor and can havedifferent shapes with for example 0.1 mm height and for example 0.25 to0.5 mm width, as shown in FIGS. 4A-4E.

FIG. 2A is an example of a dental post 200 a without groves. FIG. 2B isan example of a dental post 200 b including grooves 232 that extend toonly the cervical section 222 b of the root portion 220 b. FIG. 2C is anexample of a dental post 200 c including grooves 234 that extend to theentire root portion 220 c.

Dental Post Model 3

In a third embodiment, a dental post 300 a-b includes a head portion 310a-b and a root portion 320 a-b which includes a cervical section 322 a-band an apical section 324 a-b (See FIGS. 3A, 3B). FIG. 3A is an exampleof a dental post 300 a including a head portion 310 a (See FIGS. 9E-9H)and a root portion 320 a having three grooves, where each groove has aV-shape 332 (See FIGS. 5G-5I). FIG. 3B is an example of a dental post300 b including a head portion 310 b (See FIGS. 8E-8H) and a rootportion 320 b having four grooves, where each groove has a square-shape334 (See FIGS. 5A-5C). The cervical section 322 a-b is non-threaded andhas a flared-shape having a radially-decreasing conical axial profilealong a longitudinal axis between for example 6-18 degrees. The apicalsection 324 a-b is non-threaded tapered radially-decreasing conicalaxial profile along a longitudinal axis between for example 1-5 degrees.The dental post 300 a-b can have no grooves or 1 to 4 grooves thatextend to the entire root portion 320 a-b.

The grooves can have a diameter and a depth which radially-decreasealong a longitudinal axis of the dental post 300. The grooves can havedifferent shapes as shown in FIGS. 5A-5I. Each groove can have a cuttingactive edge 510 in the clockwise direction and a non-active edge 520 b-cin the counterclockwise direction. The cutting active edge 510 enablesthe dental post 300 a-b to be inserted and placed into a root channelwithout using excessive force. Also during insertion of the dental post300 a-b, the cutting active edge 510 can be configured to allow softself-drilling into the tooth root to give more retention andstabilization to the dental post 300 a-b.

Threads & Grooves

FIGS. 4A-4E show different examples of a cross-section of an extrusionprofile 410 a-e forming a thread. Each extrusion profile 410 a-e canhave an extrusion length 420. In an example, the extrusion length 420can be 0.1 mm, but can also be any suitable length.

FIGS. 5A-5I show horizontal cross-sections of examples of the grooves.In an aspect, the groves can have a square shape (See FIGS. 5A, 5B, 5C),a curve shape (See FIGS. 5D, 5E, 5F), and a V-shape (See FIGS. 5G, 5H,5I). In an aspect, the active edge 510 and non-active edge 520 b-c ofthe groves can have a beveled edge 520 b (See FIGS. 5B, 5E, 5H), or afillet edge 520 c (See FIGS. 5C, 5F, 5I).

Head Portion Model 1

FIGS. 6A-6F show perspective views of examples of a head portion 600having a set of horizontal grooves 610, a pair of flat surfaces 620, anda slot 630 configured to receive a dental post key. The head portion 600can have a body with for example a circular cylindrical shape. FIGS.7A-7F show perspective views of examples of a head portion 700 having aset of horizontal grooves 710, a pair of flat surfaces 720, and a slot730 configured to receive a dental post key. The head portion 700 canhave a body with circular tapered shape (e.g. 5 degree taper). Both thehead portion 600 and the head portion 700 can have two flat surfaces620, 720 along longitudinal axis, and a slot 630, 730 (e.g. 0.4 to 0.6mm width and 1 to 2 mm height) configured to receive a respective dentalpost key for driving purposes. In horizontal direction, the head portioncan include 2 to 8 grooves 610, 710 depending on a height of the headportion, and a 50 degree angle between the flat surface 620, 720 and thegrooves 610, 710. In an example, the grooves 610, 710 can have adiameter of 0.5 to 0.75 mm. A total height of the head portion can varybetween for example 2.5 to 6 mm.

Head Portion Model 2

In a third example, FIGS. 8A-8H show perspective views of examples of ahead portion 800 a-b having a body with a circular cylindrical shape, aset of horizontal grooves 810, a pair of flat surfaces 820 alonglongitudinal axis, and a first set of vertical grooves 840 alonglongitudinal axis. Optionally, the head portion 800 b can have a secondset of vertical grooves 850 (See FIGS. 8E-8H). The optional additionalvertical grooves 850 can have a groove diameter (e.g. 0.5 mm) based on ahead size and a head diameter. In an example, the first set of verticalgrooves 840 along longitudinal axis can have a 1 mm diameter. In anexample, the set of horizontal grooves 810 can include 2 to 8corresponding grooves 810, each with a 0.5 to 0.75 mm diameter, based ona height of the head portion 800. The height of the head portion 800 a-bcan vary between 3 to 7 mm.

Head Portion Model 3

FIGS. 9A-9H show side and perspective views of examples of a headportion 900 a-b. The head portion 900 a-b can include a horizontalsection having a square shape and either one slot 930 (See FIGS. 9A-9D)or two slots 930 (See FIGS. 9E-9H) for inserting a respective key fordriving purposes. The horizontal section can have a width of 1.8 to 2.5mm and a height of 2 to 4 mm. Each slot 930 can have a width of 0.4 to0.6 mm and a height of 1-2 mm according to an example.

FIGS. 10A-10K are of cross-sectional and perspective views of an exampleof a dental post including the head portion 800 a (FIGS. 8A-8D) and theroot portion 320 a (FIG. 3A). FIGS. 11A-11K are of cross-sectional andperspective views of an example of the dental post 300 b, which includesthe head portion 800 b (FIGS. 8E-8H) and the root portion 320 b (FIG.3B). FIGS. 12A-12M are of cross-sectional and perspective views of anexample of a dental post including the head portion 600 (FIGS. 6A-6F)and the root portion 220 b (FIG. 2B). FIGS. 13A-13N are ofcross-sectional and perspective views of an example of a dental postincluding the head portion 700 (FIGS. 7A-7F) and the root portion 120 b(FIG. 1B). Obviously, different combinations of the different headportions and the different root portions are possible and are within thespirit and the scope of the present embodiments. FIGS. 19A-19C showcross-sectional views of an example of a tooth model having a tooth root1810 surrounded by a periodontal ligament 1830 and a bone 1840. Thetooth model is shown restored with different root posts 1300, 1200, 1000(See FIGS. 13B, 12B, 10D), core 1920 and crown 1910.

Dental Post Key

During implantation of a dental post, a dental post key can be used tocreate a smooth reaction force to implant a threaded dental post intothe tooth root. In this way a limited force will be applied and a rootfracture can be prevented. Further, the dental post key can beconfigured to have a fixed movement in a counterclockwise direction toremove the dental post and a free quarter-cycle movement with effort ina clockwise direction.

FIG. 14A shows a perspective drawing of a dental post key 1400 includinga body 1410 for handling and a post carrier 1420 having a distal endwith a key shape 1422 configured to turn a respective dental post. Thedental post key 1400 is shown with a cover 1440 for the body 1410 with acentral opening configured to allow a portion of the post carrier 1420to pass through. The body 1410 can have a plurality of ridges 1414 on anouter surface configured to enhance gripping by an operator. A proximalend of the post carrier has an elongated shape. The body includes a pairof abutments 1412 configured to prevent the post carrier from rotating.Each abutment 1412 can include a threaded hole 1444 configured toreceive a screw, such that the cover 1440 can be secured by a set ofscrews 1442 to each abutment 1412 according to an example.

In an example, a dental post key 1400 a can include a set of springs1430 that are configured to connect, or resist a force between, a postcarrier 1420 a to the body 1410 (See FIGS. 14B, 14E). Alternatively, thedental post key 1400 a can include only one spring 1430 configured toconnect the post carrier 1420 a to the body 1410. In an example, eachspring can be configured to have a different spring constant. In anexample, a dental post key can include a first spring having a firstspring constant and a second spring having a second spring constant. Inan example, the second spring constant is substantially different thanthe first spring constant such that, when the dental post key isrotated, each spring is configured to create a dynamic reaction force toimplant the dental root post into the tooth root.

FIG. 14E shows a perspective drawing of expanded parts of the dentalpost key of FIG. 14B according to an example. The post carrier 1420 aand the two abutments 1412 having a set of securing areas (e.g. holes)1424 configured to secure the set of springs 1430. FIGS. 15A-15F show aseries of perspective views of an example of the post carrier 1420 a.

In an example, a dental post key 1400 b can include a set of torsionsprings 1432 that are configured to connect, or resist a force between,a post carrier 1420 b to the body 1410 (See FIGS. 14C, 14F). FIG. 14Fshows a perspective drawing of expanded parts of the dental post key ofFIG. 14C according to an example. The post carrier 1420 b is shownhaving a knob 1426 configured to secure the set of torsion springs 1432.The knob 1426 can be recessed into the proximal end of the post carrier1420 b.

In an example, a dental post key 1400 c can include a post carrier 1420c having at least one plate spring 1428 that is configured to connect,or resist a force between, the post carrier 1420 c to the body 1410 (SeeFIG. 14D). In an example, the plate spring 1428 can be an extension of ashape of the post carrier 1420 c. In another example, the spring 1428can be a separate piece.

FIGS. 16A-16G are a series of perspective views of an example of thepost carrier 1420 b. FIGS. 17A-17F are a series of perspective views ofexamples of a key shape of a post carrier configured to match arespective dental post.

FIG. 18 shows an example of a dental post key with the post carrier 1422a (see FIG. 17A), and the post model 100 a (see FIG. 1A) that isconfigured to be implanted into a prepared root canal 1820 of a toothroot 1810 in clockwise direction. The cross-sectional view of the toothmodel shows the tooth root 1810 surrounded by the periodontal ligament1830 and the bone 1840.

Obviously, numerous modifications and variations of the presentinvention are possible in light of the above teachings. It is thereforeto be understood that within the scope of the appended claims, theinvention may be practiced otherwise than as specifically describedherein.

1-6. (canceled) 7: A dental implantation system for tooth restoration, adental post key and a dental root post, wherein the dental root post hashead portion and a root portion, wherein the root portion has a conicalsection with threads to engage in bone or tooth tissue, and the headportion has a top end with a dental root post shape, wherein the dentalpost key comprises: a body having an exterior surface and an abutment onan inner surface; and a post carrier having: a distal end configured tohave an opening having a shape configured to receive the dental rootpost shape of the dental root post, a proximal end having a rigidelongated shape that is configured to be in contact with a first side ofthe abutment of the body, a flexible elongated shape that is configuredto be in contact with a second side of the abutment of the body, whereinthe post carrier further has a second flexible elongated shape, whereinthe flexible elongated shape is configured to have a first springconstant and the second flexible shape is configured to have a secondspring constant that is different than the first spring constant,wherein, when the body is rotated, a combination of both the flexibleelongated shape and the second flexible shape is configured to create adynamic reaction force to implant the dental root post into a toothroot.
 8. (canceled) 9: The dental implantation system of claim 7,wherein the body has a second abutment, wherein the rigid elongatedshape of the post carrier is configured to be in contact with the firstside of the abutment of the body, wherein the flexible elongated shapeof the post carrier is configured to be in contact with the secondabutment of the body. 10-12. (canceled) 13: The dental implantationsystem of claim 7, wherein the root portion of the dental root postfurther has a cervical section. 14: The dental implantation system ofclaim 13, wherein the cervical section does not have threads. 15: Thedental implantation system of claim 7, wherein the cervical section hasa tapered radially-decreasing conical axial profile along a longitudinalaxis. 16: The dental implantation system of claim 15, wherein thetapered radially-decreasing conical axial profile tapers at an angle of1-5 degrees. 17: The dental implantation system of claim 13, wherein thecervical section has threads. 18: The dental implantation system ofclaim 7, wherein the cervical section has a tapered radially-decreasingconical axial profile along a longitudinal axis. 19: The dentalimplantation system of claim 15, wherein the tapered radially-decreasingconical axial profile tapers at an angle of 6-18 degrees.